Apparatus for making paper barrel-staves.



J. T. COLLINS. APPARATUS FOR MAKING PAPER. BARREL STAVES.

nrmonzon rum) APR. 1a, 1908.

912,284. Patented Feb. 16, 1909.

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APPARATUS FOR MAKING PAPER BABREL-STAVES.

Application filed April 13, 1908.

To all whom it may concern:

Be it known that 1, JOHN T. COLLINS, a citizen of the United States ofAmerica, and resident of Hartford, in the county of Hartford and Stateof Connecticut, have invented certain new and useful Improvements inApparatuses for Making Paper Barrel- .Staves, of which the following isa full, clear, and exact description.

This invention pertains to apparatus for making paper barrel staves, andhas for its object an improved apparatus which in a single operationwill cut, shape and form the chines and crozes, and simultaneouslycompress the staves into the desired finished product ready forpurposesof assemblage into barrels, or the like.

The invention further consists in the con struction, arrangement andcombination of parts to be hereinafter set forth.

In the drawings: Figure l, is an inverted view of the male die forming apart of the invention, Fig. is a plan view of the female or bed d'e,Fig. 3, is a longitudinal section taken through the two dies the same inthe act of forming a stave, Fig. 4;, is a transverse section of Fig. 3,on line 4; lof Fig. 3, Fig. 5, is a fragmentary view slightly enlargedshowing the stock of sheeted paper pulp from which the staves formed,showing in dotted lines the extentof steaming or otherwise softening ofthe stock, Fig. 6, is

an enlarged transverse section taken through a completed stave,illustrating by dottec lines the form assumed by stares of paper pulpafter having been made accoroing to the practice which has generallyobtained prior to this invention, and Fig. 7, is a reduced transversesection of a stave blank showing by dotted lines the extent of softeningof the sheeced paper pulp.

The female or bed die is composed of a base plate 1, on the upper faceof which the die proper is carried, the latter as depicted in thedrawings having a concave compression face or surface 2 whose curvatureconforms to that of the outer side or face of the finished stave. r-adjacent the bounding edges of surface 2, the die is formed with agroove 3, which in outline conforms to that of the stave product, thisgroove receiving a filling of lead or other soft metal 4, for purposepresently obvious. Base plate 1, is equipped with guiding posts 5,projecting upwardly therefrom, whose function it is to provide guidingmovement to the male die member Specification of Letters Patent.

Patented Feb. 16, 1909.

serial No. 427,924.

in its operations, for which purpose the supporting plate 6 of the maledie member is formed with openings 7, receiving posts 5.

The male die member is formed with a die compression face or surface 8,of convex con our, its curvature corresponding to that of the female dieface or surface. Suitably secured to the sides and ends of the male dieare cutting blades 9 the side blades being shaped or curved from end toend to conform the configuration of the finished staves, which lattertaper in curved lines from their middle portions to their ends. it is tobe especially observed in Fig. i, that the inner side faces of theblades 9, are tapered as indicated at 9', so as to impart to the sideedges of the staves their proper angularity. The end blades prescribethe predetermined length of the staves and when combined with the sideblades constitute, so to speak, the sharpened walls of a box. The bladesor knives are beveled at their free ends as indicated at 10, so as toeffect a positive and clean cut of the paper pulp, the knives or bladesfinding a so t bed in the inset lead strips 4:, as above set forth so asto not dull or otherwise impair the efliciency of the cutting edgesofthe knives or blades. The male die member on its die face is furtherformed adjacent its ends with outwardly projecting oroze forming ribs11, whose function it is to form the croze at each end of the stave.Beyond these ribs the male die face is formed with a slight depression12, to form the chines.

Prior to subjecting the stock of which the staves are formed to theaction of the apparatus above set forth, the stock, which may be in theform of a sheet or strips of proper dimensions, is steamed, moistened orotherwise softened at the external or surface portions only, leaving thegreater mass or bulk at the inside in its normal hard condition. By sosoftening only the surface portions of the staves, stock or blank asdepicted by dotted lines in Fig. 5 of the drawings, the finished stavewhen removed from the dies at the completion of their operation, retainsits proper are shape. l i ere the stock to be softened by steamingentirely through its mass, a stave after leaving the dies, would indrying curl in an extreme manner is shown by dotted lines Fig. 6. Y

The stave stock or blanks are produced is therefore to be observedthatthe surface orpartial softening of the olanks is of the greatest andutmost importance, since the body, mass, or bulk of the blank is allowedto remain in itsoriginal hard condition, and 1s in fact given a secondcompression to further increase 1ts degree of hardness.

Moreover it is to, be'noted that the softened.

mass of pulp will by the act of compression be hardened to an extremedegree inasmuch as the unsoftened or hard portion of the mass of pulpwill provide a firm solid bed on which the softened mass is compressed.Thus. both the softened and unsoftened portions profit by theirdifferent stated conditions during the process of compression.

In operation the stock as aforesaid either in sheets or in strips ofproper length having been surface softenedis introduced be tween the twodies. The male die is then operated in any suitable manner to compressthe sleek so that the same assumes the position between the dies asdepicted in Fig. 3 of the drawings. The descent of the male die upon thestock is accompanied by simultaneous cutting action of the blades whichtrim the stock and cut the same into desired length and Width. Thechines and crozes are also formed in this stated operation and tl:e sideblades due to their bevel as illustrated in Fig. 4, impart the requiredangularity to the stave sides such as is necessary to provide a perfectfit between adjacent staves in the finished barrel. The lead inset orfilling contacts with the cutting edges of the knives and therebyprovides a sealing joint or unionbetween the two dies preventing theegress of the softened pulp during the heavy compres ion of the-stock.

Having thus fully described the invention, what is claimed is 1. Anapparatus for making paper pulp barrel staves embodying meansto'simultaneously cut, shape, compress andv form chines and crozes inthe staves.

2. An apparatus for making paper pulp barrel staves consisting of a pairof cooper:

ating dies to receive the paper pulp stock therebetween and compress,shape and form the'crozes and chines therein, and means whereby thestock is simultaneously cut into the desired proportions.

3. An apparatus for making paper pulp staves consisting of a pair ofcooperating dies to receive the stock therebetween to shape and compressthe same, and knives carried by one of said dies to cut the staves intothe desired proportions.

4. An apparatus for making paper barrel staves consisting of a male anda female die, ribs carried by the male die to form crozes in thestaves,and knives at thesides and ends of said male die to cut the staves.

5. Anapparatus for making paper barrel staves consisting of a male and afemale die to receive the stock therebetween to shape and compress thesan1e,means carried by the male die to form chines and crozes in thestaves and knives carried by the male die and arranged thereon to cutthe staves inthe desired proportion.

6. An apparatus for making paper barrel staves consisting of a male anda female die to receive the stock therebetween to shape and compress thesame, ribs on the male die to form crozes in the staves, the male die atits ends beyond said ribs being shaped to form chines in the staves,knives secured along the sides and ends of said male die, and an insetfilling of solid material softer than the knives carried by the femaledie to cooperate with said knives to form a sealing union between saiddies during the act of compression.

7. An apparatus for making pulp barrel staves embodying means tosimultaneously compress, shape and cut the staves into requisite size.

8. An apparatus for making pulp barrel staves consisting of a male and afemale die to compress and shape the stave therebetween, end and sideknives carried by one of said dies. to cut the staves into requisitelength, the side knives on the inner faces being shaped to form thestave sides inclined.

Signed by me at Springfield, Mass, in presenceof two subscribingwitnesses.

JOHN T. COLLINS.

lVitnesses:

\V. S. BnLLows, G. R. Dmsoonn.

